Lathe-tool holder



Patented Nov. l5, 1927. UNITED` STATES PATENT OFFICE.

JOHN C, STAFFORD, GF CLEVELAND', OHIO.

LATHE-TOOL HOLDER.

Application. filed May 25, 1926. Serial No. 111,627.

rlhis invention relates to a lathe tool transverse recess 4, the longitudinally eX- holder and has for its primary object the tending clamping screw which is threaded provision, in a manner as hereinafter set into the upper end of the post and is adapted forth, of an improved type of construction to extend throughout the recess 4 in the 60 5 of a clamp or holder for holding in working manner shown, and the headv 6 which is position a turning tool and a cutting olf and adapted to be positioned in the 'lslot of the threading tool. carriage 1.

The invention contemplates the provision The tool clamp embodying this invention of a clan'iping structure through the center comprises a relatively large flat body 7 hav 65 of which the usual lathe tool post is adapted ing a straight side 8 and further having a to extend. The clamping screw of the tool nos-e portion 9 extending from the opposite post acts to secure the tool clamp securely side thereof, the nose portion 9 having a against the top of the post carriage, so that passage 10 running therethrough, which the tool clamp enabled to hold a pair of passage extends at an obtuse angle with 7o tools in operative position, in such a manner respect to the side 8. The body has that when the operator has finished using one formed therethrough arallel with the fiat of 'the tools, the work can be moved directly side 8 transversely of t e length of this side, to and operate upon by the other tool held the pair of align-ed passages 11 and 12,v by theholder, without the trouble of removrespectively, the passage 12, as shown in F ig- 75 ing the lirst tool. ure 3, being of materially greater diameter The invention has for a final object the than the passage 11 and having threads 13 provision, in a Amanner as hereinafter set formed upon tle wall thereof. forth, of a lathe tool clamp which is of sim The body 7 is split transversely of the ple construction, strong and durable, de longitudinal center of the passages 11 and 12`r signed to save time and labor and compara* as indicated at 14, the split being formed tively inexpensive tomanufacture. y from the side 8 inwardly to a point beyond The invention will be best understood the center of the body. At the central porn from a consideration of the 'following tion of the body the slit le merges into a detailed description taken in connection polygonal passage 15 which extends through Sv so with the accompanying drawing forming a the body parallel with the slit 14 and through part of this specification, with the under the longitudinal center of the passage 11. stainling that the invention is not confined F rom this description it will be seen that to any strict conformity with the showing the body 7 at one side, due to the slit 14, is of the drawing but may be changed and formed into a pair of spaced portions 16 9o modified so long as such changes and modiand 17 which may be sprung together by iications mark no material departure from Suitable straining means such as the clampthe salient features of the invention as ing screws 18 which pass through the upper expressed in the appended claim. member 1T into and engaging the lower 1n the drawing member 16A The portion 16 has its outer 95 lligure 1 shows a lathe tool post in side face recessed as at 19 to receive a cutting oil' elevation, showing the tool clamp struct-ure and threading tool 20, the upper edge of the embodying this invention, mounted thereon. tool 20 when positioned in the recess 19 being Figure 2 shows the tool clamp embodying engaged by the upper portion 17 and as will this invention in top plan, the tool post be readily seen when the upper portion 17 is 100 tra being removed. sprung downwardly by means of the bolts Figure 3 shows a transverse section taken or screws 18, the tool 20. will be securely upon the line 3-3 of Figure 2. clamped between the portions 16 and 17 in Referring now to the drawing` in detail the manner indicated in Figures 1 and 2. wherein like numerals of reference indicate Adapted to be threaded into the passage .to corresponding parts throughout the 'several 12, is an adjusting collar 21 having a central views, the numeral 1 indicates the usual tool passage 22 therethrough which is of the post carriage of a lathe, the T-slot of the same diameter as the passage 11. carriage being indicated by the numeral 2. i'Vhen the tool clamp body T is in position,

A lathe tool post of the usual construction the tool post 3 extends through the passages 110 51'? is indicated by the numeral 3, these posts as 11 and 22 and the lower flanged portion of is well known, being provided with the the collar 21 rests upon the carriage l.

When in suohiposition, a clamp bar 23 is extended through the passage 15 in the body 7 and by turning down the screw 5 to engage the top of the clamp bar 23, the head G oi the tool post will be drawn up to engage tightly in the slot 2 of the carriage and the clamp body 7 will be held securely doun upon the top of the carriage as .shown in Figure 1.

Extending transversely of one end of the clamp bar 23 is a retaining pin 24 and there is extended jnto the underside of the bar at the other end thereof a short pin 25. A slot 26 is formed in the lower side ot' the passage l5 upon one side of the body so that the pin 25 can pass to allow the bar 2B to be partially Withdrawn from the passage 15. A similar' short slot 27 is termed in the other side of the body in alignment with the slot 26 to allow the pin 25 to pass into the body far enough to give a clearantfe for the Withdrawal of the post 3. The bar 23 is thus easily and quickly shifted tor the insertion or removal of the tool post 3 and at thesame time is securely held against complete re moval.

A turning tool 2S is extended into the passage 10 at the opposite side of the clamp from the cutting oli1 blade or tool 20 and this turning tool may be held securely in po sition by means ot the clamp screw Q9.

When the clamp 7 and tool post 3 are in position as shown in Figure l, adjustment may be made for locating the center of the lathe spindle, by loosening the clamp screw 5 and turning the adjusting collar 2l to raise or lower the clamp body 7 to the desired position whereupon the clamp screw 5 is again threaded downwardly to bind against and torce the clamp bar E23 downwardly at the same time drawing up upon the post 3 to cause the head to engage tightly in the T-slot Q. By this means all turning, threading7 forni cutting and cutting oil' tools can be kept in line With the center of the work.

A set sci-euT 30 is tapped through the side of the body 7 and engages the threaded portion of the collar 2l, so when proper vcrtieal adjustment has been made by means of the collar the set screw can be employed to secure the two members together and thereafter the entire structure can he ren'ioved from the lathe Without changing the other adjustments.

It will thus be seen from the foregoing description and accompanying drawing that the clamp T may he made to carry a turning tool and a cutting off threading blade or tool in the manner shown so that when a piece ol Work is acted upon by the turning tool and the operation thereof is con'lpleted, the cutting all' and threading tool may be immediately brought into operation and the Work continued Without the necessity ol' stopping to change tools. A decided saving in time and Work is thus had.

Having thus described my invention what l claim is A lathe tool holder, comprising a tool post adapted for slidable connection with a lathe carrier, a sleeve loosely surrounding the post and having contact with the lathe carrier, a transversely recessed block loosely engaged over the pest and vertically adjustable on the sleeve and having a split in one side coextensive with the recess in said block. a socleted extension for lthe block and dis posed tangentially to the post-` a liindintr screw in the post, and eet serene engaged in the block at its split side and intersecting the split. j

In testimony whereof, l allin my signature hereto.

JOHN C. STAFFORD. 

